/Engine/Plugins/Experimental/Fracture/Source/FractureEngine/Public/FractureEngineClustering.h
Cluster bodies into k partitions using K-Means. Connectivity is ignored: only spatial proximity is considered.
void KMeansPartition ( int32 InPartitionCount, int32 MaxIterations, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const FVector > InitialCenters )